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Investments (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) investment | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of separate property or fund co-investments | investment |  | 47 |  |
Investments |  | $ 866.5 |  | $ 816.6
Fair Value [Abstract] |  |  |  |
Fair value investments at beginning of the period |  | 740.8 | $ 794.9 |
Investments in Real Estate Ventures, at Fair Value, Additions |  | 80.6 | 141.1 |
Investments in Real Estate Ventures, at Fair Value, Distributions |  | (17.3) | (20.2) |
Unrealized Gain (Loss) on Investments |  | (10.7) | (121.8) |
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation |  | 2.1 | (1.2) |
Fair value investments at end of the period | $ 792.8 | 795.5 | 792.8 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value [Abstract] |  |  |  |
Fair value investments at beginning of the period | 438.1 | 367.3 | 452.0 |
Fair value investments at end of the period | 64.2 | 378.8 | 64.2 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Investments [Member] |  |  |  |
Fair Value [Abstract] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | $ 3.1 | 8.4 | $ 66.9 |
JLL Technologies |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | 10.5 |  |
Investments |  | 423.4 |  | 397.6
LaSalle Investment Company II [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | 60.3 |  |
LaSalle Investment Management |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | 233.0 |  |
Investments |  | 411.0 |  | 388.3
Other Investments and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments |  | $ 32.1 |  | $ 30.7

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